JP4476421B2 - Motorcycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motorcycle in which a fuel injection type parallel multi-cylinder engine is mounted on a twin-pipe body frame.
[0002]
[Prior art]
In recent motorcycles, the engine crankcase and cylinder are fixed to a twin-pipe body frame, and the engine itself is used as a strength member for the body frame to reduce the weight and size of the body. It is used a lot. In this layout, the engine is held so as to be sandwiched between a pair of left and right main pipes of the body frame. When the engine is a fuel injection type, a fuel injection device (throttle body) is also installed between the left and right main pipes, and a main throttle valve drive unit and a sub-throttle valve drive unit built in the fuel injection device Are arranged together on one side of the fuel injection device.
[0003]
The movement of the throttle grip operated by the rider is transmitted to the drive unit of the main throttle valve via a cable, and the main throttle valve opens and closes in accordance with the movement of the throttle grip. On the other hand, the power of an actuator using a stepping motor or the like is transmitted to the driving portion of the sub-throttle valve via a cable or the like. This actuator is operated by the operation control unit, and the opening of the sub throttle valve is set according to the opening of the main throttle valve and various operating conditions.
[0004]
[Problems to be solved by the invention]
By the way, when the engine is of the parallel multi-cylinder type in the above configuration, the lateral width of the main pipe of the vehicle body frame located on both sides of the engine itself tends to increase because the lateral width of the engine itself increases. If the main and sub throttle valve drive parts of the injection device are arranged together on one side of the fuel injection device, the assembly of both drive parts protrudes outward from the engine, and the left and right sides of the main pipe The interval will be further expanded.
[0005]
For this reason, not only the rideability of riders who straddle the knees between the outer sides of the main pipe (knee grip) is greatly impaired, but the width of the motorcycle increases and the front projection area increases, This causes adverse effects such as deterioration of running performance such as aerodynamic characteristics and fuel efficiency characteristics. In addition, since only the main pipe on the side where the drive portion of the throttle valve is provided bulges outward, the body frame becomes asymmetrical, making it difficult to design and manufacture.
[0006]
The motorcycle according to the present invention has been invented to solve the above-described problems, and its object is to provide a vehicle body frame in which a fuel injection type parallel multi-cylinder engine is mounted on a twin-pipe body frame. It is intended to prevent the distance between the left and right of the main pipe from being increased, to avoid deterioration of rider riding performance and traveling performance, and to facilitate the design and manufacture of the body frame.
[0007]
A further object of the motorcycle according to the present invention is to improve the durability of the actuator for driving the sub-throttle valve of the fuel injection device and to allow the fuel injection device to be installed close to the engine, thereby reducing the size of the engine. There is.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a motorcycle according to the present invention includes a plurality of fuel injection devices arranged in a row in the vehicle width direction between a pair of left and right main pipes constituting a vehicle body frame. In a motorcycle in which a parallel multi-cylinder engine is mounted and a main throttle valve and a sub-throttle valve are installed inside each fuel injection device, each fuel injection is overlapped with the main pipe (10) in a side view of the vehicle. A device (18) is arranged, and a drive portion (71) of the main throttle valve (66) is arranged on one side surface of the fuel injection device located on the most side in the vehicle width direction of each fuel injection device (18). the most vehicle width located towards the other side the other side surface of the fuel injector drive unit of the sub-throttle valve (67) (72) the arrangement of the fuel injector (18) with These drive parts (71, 72) are arranged within the vehicle width direction dimension of the engine (17) portion that overlaps the main pipe (10) in a side view of the vehicle, and each fuel injection device (18) It has an actuator (85) interlockingly connected to the drive part (72) of the valve (67), and the actuator (85) is provided on the inner side in the vehicle width direction from the drive part (72) of the sub-throttle valve (67). When the actuator (85) is arranged offset from the fuel injection devices (18) in a side view of the vehicle and a camshaft drive mechanism (48) is provided on one side of the engine (17). you wherein the drive portion of the main throttle valve (66) to (71) were placed in the vehicle width direction opposite to the engine in which the camshaft drive mechanism (48) is provided . With this configuration, the drive part of the main throttle valve and the drive part of the sub-throttle valve are distributed and arranged on both sides of each fuel injection device, and each drive part fits in a small space and protrudes outward from the engine. This eliminates the possibility of increasing the distance between the left and right main pipes of the body frame.
[0010]
Further, according to the motorcycle according to the present invention, as described in claim 2 , in the configuration according to claim 1, the actuator includes a fuel tank installed on an upper portion of the main pipe, a main pipe, It was placed in a space surrounded by the engine. By doing so, the actuator is surrounded by the member group, so that damage and contamination are prevented and durability is improved.
[0011]
Further, according to the motorcycle according to the present invention, as described in claim 3 , in the configuration according to claim 1 or 2, the valve position sensor for detecting the opening of the main throttle valve is driven by the sub throttle valve. Provided on the side of the section. In such a case, since the valve position sensor is provided adjacent to the sub throttle valve drive part whose volume is smaller than that of the main throttle valve drive part, it is possible to secure a sufficient installation space for the valve position sensor. By preventing the protrusion to the side, it is possible to prevent the distance between the left and right main pipes of the body frame from being increased.
[0012]
The motorcycle according to the present invention, as described in claim 4, in the structure according to any one of claims 1 to 3, the longitudinal direction of the longitudinal direction the main pipe of the throttle passage in a side view The position of the fuel injection device is set so that the upper throttle valve of the main throttle valve and the sub throttle valve is located above the upper edge of the main pipe. According to this configuration, since the drive portion of the throttle valve located on the upper side is provided without interfering with the main pipe of the vehicle body frame, it is possible to more effectively prevent the main pipe interval from being increased.
Further, as described in claim 5 , the motorcycle according to the present invention is the configuration described in any one of claims 1 to 4 , wherein a camshaft drive mechanism is provided on one side of the engine. In this case, the drive portion of the main throttle valve is disposed on the opposite side in the vehicle width direction of the engine provided with the camshaft drive mechanism. As a result, the sub-throttle valve drive unit having a volume smaller than that of the main throttle valve drive unit is arranged on the cam shaft drive mechanism side of the engine, so that it does not interfere with the cam shaft drive mechanism protruding in the longitudinal direction of the engine. The fuel injection device can be brought close to the engine, and the engine can be made compact.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a left side view showing an example of a motorcycle according to the present invention.
[0014]
In this motorcycle 1, a front fork 4 that supports a front wheel 3 is pivotally supported together with a handlebar 5 and the like on a front part of a twin-pipe body frame 2 so that the vehicle can be rotated at the lower center of the body frame 2. A swing arm 8 that supports the rear wheel 7 is pivotally supported by a pivot shaft 6 that is pivotally supported in the width direction so as to be rotatable up and down.
[0015]
The front half of the vehicle body frame 2 is constituted by a pair of left and right main pipes 10, and the rear half is constituted by a seat frame 11 having a substantially truss structure, and a pair of left and right frame centers 12 are provided between the main pipe 10 and the seat frame 11. Is provided. The left and right main pipes 10 and the left and right frame centers 12 are connected by a plurality of bridge members (not shown) extending in the vehicle width direction.
[0016]
A fuel tank 14 is placed on the main pipe 10, and a rider seat 15 and a pillion seat 16 are provided on the seat frame 11. The engine 17 is mounted so that the lower portion and the upper portion of the main pipe 10 are sandwiched between the left and right main pipes 10. The engine 17 is of a fuel injection type, and as shown in FIGS. 2 and 3, four fuel injection devices 18 are connected laterally at the rear of the upper portion thereof, and a box-shaped air is provided above the fuel injection device 18. A cleaner 19 is connected. The air cleaner 19 is accommodated in a recess 14 a formed on the lower surface of the fuel tank 14. In addition, the member shown with the code | symbol 20 is a fuel pump.
[0017]
The engine 17 is, for example, a parallel 4-cylinder four-cycle DOHC engine, and a cylinder block 22, a cylinder head 23, and a head cover 24 are installed in front of the upper surface of the crankcase 21 so that the crankcase 21 is an upper case 25. A middle case 26 and a lower case 27 are divided into three parts, and an oil pan 28 is attached to the lower part of the lower case 27.
[0018]
An upper case 25 of the crankcase 21 is integrated with a lower portion of the cylinder block 22, and a crankshaft 30 along the vehicle width direction is pivotally supported on a mating surface between the upper case 25 and the middle case 26. Two transmission shafts 31 and 32 are pivotally supported on the mating surface between the lower case 27 and the rear position of the crankshaft 30.
[0019]
On the other hand, four cylinder bores 33 are formed side by side inside the cylinder block 22, and four combustion chambers 34 aligned with the respective cylinder bores 33 are formed on the lower surface of the cylinder head 23, and slide into the cylinder bores 33. A connecting rod 38 connects the freely inserted piston 35 (piston pin 36) and a crank pin 37 provided eccentric to the axis of the crank shaft 30.
[0020]
Further, an intake port 41 and an exhaust port 42 communicating with the inside of each combustion chamber 34 from the outside are formed in the cylinder head 23, and an intake valve 43 provided in each intake port 41 and each exhaust port 42 are provided. The exhaust valve 44 is controlled to open and close at a predetermined timing by an intake cam shaft 45 and an exhaust cam shaft 46 that are respectively supported in the cylinder head 23. The intake camshaft 45 and the exhaust camshaft 46 are rotationally driven by a camshaft drive mechanism 48 provided on one side (for example, the right side) of the engine 17 as shown in FIG.
[0021]
The camshaft drive mechanism 48 is, for example, a chain drive type, a drive sprocket 49 provided near the right end of the crankshaft 30, a driven sprocket 50 provided near the right ends of the intake camshaft 45 and the exhaust camshaft 46, A timing chain 51 wound around these sprockets 49 and 50 and a chain tensioner (not shown) are provided, and the rotation of the crankshaft 30 is reduced by half to reduce the intake camshaft 45 and the exhaust cam. Is transmitted to the shaft 46.
[0022]
The reciprocating motion of the piston 35 in each cylinder bore 33 is converted into the rotational motion of the crankshaft 30 by the connecting rod 38, and the rotation of the crankshaft 30 is changed by a transmission device (not shown) mounted on the two mission shafts 31 and 32. Then, it is taken out as the output of the engine 17 and transmitted to the rear wheel 7 by the drive chain 53 (see FIG. 1).
[0023]
Each intake port 41 is connected to the lower portion of the fuel injection device 18 described above, and each exhaust port 42 is connected to an exhaust pipe 54 (see FIG. 1). The exhaust pipe 54 extends rearward around the lower surface of the engine 17 and is connected to the exhaust muffler 55. The front half of the motorcycle 1 is covered with a streamlined cowling 56, and the cowling 56 hides the engine 17, the fuel injection device 18, the exhaust pipe 54, and the like from the outside.
[0024]
As shown in FIG. 3, the four fuel injection devices 18 are fixed in a horizontal row and unitized, and are arranged between the left and right main pipes 10 of the vehicle body frame 2 as shown in FIG. On the other hand, the inside of the air cleaner 19 is partitioned into a dirty side 58a and a clean side 58b by an air filter 58. The dirty side 58a is provided with an air inlet 59 that opens in front of the cowling 56, and a fuel injection device is provided on the clean side 58b. 18 is connected.
[0025]
As shown in FIGS. 2 and 4, each fuel injection device 18 has a throttle passage 61 formed inside the throttle body 61 and an injector nozzle 63 provided outside. The fuel injection device 18 crosses the throttle passage 62 in the vehicle width direction. A butterfly-type main throttle valve 66 and a sub-throttle valve 67 are provided on the valve shafts 64 and 65, respectively, which are rotatably supported by the motor.
[0026]
The main throttle valve 66 and the sub throttle valve 67 rotate with the rotation of the valve shafts 64 and 65 to change the passage area of the throttle passage 62. The four valve shafts 64 and the valve shafts 65 are integrally connected between the four fuel injectors 18 so that the opening degree of the four main throttle valves 66 and the opening degree of the four sub throttle valves 67 are determined. It is designed to be fully synchronized. The sub throttle valve 67 is provided upstream of the main throttle valve 66.
[0027]
In addition, the injector nozzle 63 of each fuel injection device 18 is disposed on the downstream side of the main throttle valve 66 and connected by a delivery pipe 68 extending in the vehicle width direction, and the fuel in the fuel tank 14 is supplied from the delivery pipe 68 to each injector nozzle 63. Evenly distributed and injected into the throttle passage 62.
[0028]
Further, in the side view (see FIG. 2), the position of each fuel injection device 18 is such that the throttle passage 62 is connected straight to the intake port 41 of the engine 17 and the longitudinal direction of the throttle passage 62 is the main pipe 10 of the vehicle body frame 2. Of the main throttle valve 66 and the sub throttle valve 67, the throttle valve located on the upper side, that is, the sub throttle valve 67 (valve shaft 65) here is the upper edge of the main pipe 10. It is determined so as to be located above.
[0029]
As shown in FIG. 3, a drive portion 71 of the main throttle valve 66 is provided on the opposite side of the camshaft drive mechanism 48 of the engine 17, that is, on the left side of the leftmost fuel injection device 18 (also in FIG. 5). reference). On the other hand, on the right side surface of the rightmost fuel injection device 18, a drive portion 72 of the sub-throttle valve 67 and a valve position sensor 73 (see FIG. 6) for detecting the opening degree of the main throttle valve 66 are provided.
[0030]
The drive portion 71 of the main throttle valve 66 includes a main valve pulley 75 that is rotatably and integrally fixed to the left end of the valve shaft 64, two throttle cables 76 and 77 connected to the main valve pulley 75, and a main valve pulley. 75, a return spring 78 (see FIG. 3) for biasing in the closing direction, an idling speed adjuster 79, and the like. The other end of each of the throttle cables 76 and 77 is a throttle grip ( (Not shown). The valve position sensor 73 is provided coaxially at the right end of the valve shaft 64, and a harness 80 extending from the valve position sensor 73 is connected to an operation control unit (not shown).
[0031]
The drive portion 72 of the sub-throttle valve 67 includes a sub-valve lever 82 that is rotatably fixed to the right end of the valve shaft 65 and two control cables 83 and 84 that are connected to the sub-valve lever 82. The other ends of the control cables 83 and 84 are connected to a drive pulley 87 of a stepping motor 86 built in the actuator 85. As shown in FIG. 2, the actuator 85 is disposed in a space surrounded by the main pipe 10, the fuel tank 14, and the engine 17 of the vehicle body frame 2 . Is arranged offset from the fuel injection device 18 to the rear, thereby preventing the actuator 85 from being damaged or fouled, thereby improving durability. A harness 88 extending from the stepping motor 86 of the actuator 85 is also connected to the operation control unit.
[0032]
In the motorcycle 1 configured as described above, when the rider twists the throttle grip, the rotation of the throttle grip is transmitted to the main valve pulley 75 via the throttle cables 76 and 77, and the rotation of the main valve pulley 75 is the valve. The main throttle valve 66 is rotated via the shaft 64. The opening (rotation amount) of the main throttle valve 66 is detected by the valve position sensor 73, and the data is input to the operation control unit.
[0033]
The operation control unit changes the fuel injection amount from the injector nozzle 63 in accordance with the opening degree data of the main throttle valve 66 and data of various operating conditions (for example, vehicle speed, shift position, outside air temperature, cooling water temperature, air pressure, etc.). At the same time, the actuator 85 is operated to change the opening degree of the sub valve lever 82. When the stepping motor 86 of the actuator 85 is operated, the rotation of the drive pulley 87 is transmitted to the sub valve lever 82 via the control cables 83 and 84, and the rotation of the sub valve lever 82 is transmitted via the valve shaft 65 to the sub throttle valve 67. Rotate.
[0034]
As the amount of rotation of the main throttle valve 66 and the sub throttle valve 67 increases, the passage area of the throttle passage 62 increases and the amount of fuel injection from the injector nozzle 63 increases, and the output of the engine 17 improves. The operation control unit always appropriately controls the fuel injection amount and the opening degree of the sub-throttle valve 67 so that the optimum air-fuel ratio is provided under all operation conditions. By operating the idling speed adjuster 79, the idling speed can be adjusted by changing the position of the main valve pulley 75 during the idling operation of the engine 17 (the minimum opening of the main throttle valve 66).
[0035]
In the motorcycle 1, a drive unit 71 of the main throttle valve 66 is disposed on one side (left side) of the four fuel injection devices 18, and a drive unit 72 of the sub throttle valve 67 is disposed on the other side (right side). Since both drive parts 71 and 72 are distributed and arranged on the left and right sides of the fuel injection device 18, the respective drive parts 71 and 72 do not protrude outward from the engine 17 in a small space.
[0036]
Therefore, the installation of the drive units 71 and 72 does not increase the distance between the left and right of the main pipe 10 of the vehicle body frame 2, and as shown in FIG. R ride is not impaired. In addition, since the increase in the vehicle width and front projection area of the motorcycle 1 can be suppressed, the running performance such as aerodynamic characteristics and fuel consumption characteristics is not deteriorated. In addition, since only the main pipe 10 on one side does not bulge outward, the body frame 2 can be formed symmetrically to facilitate design and manufacture.
[0037]
Further, since the valve position sensor 73 is provided on the side of the drive portion 72 of the sub-throttle valve 67 whose volume is smaller than that of the drive portion 71 of the main throttle valve 66, a sufficient installation space for the valve position sensor 73 can be secured. As a result, the valve position sensor 73 can be prevented from projecting to the side, and the interval between the main pipes 10 can be prevented more effectively.
[0038]
Further, in the side view, the longitudinal direction of the throttle passage 62 is substantially orthogonal to the longitudinal direction of the main pipe 10, and the sub-throttle valve 67 located above the main throttle valve 66 is located above the upper edge of the main pipe 10. Since the position of the fuel injection device 18 is set as described above, the drive portion 72 of the sub-throttle valve 67 can be provided without interfering with the main pipe 10, and this can also contribute to preventing the main pipe 10 from being enlarged.
[0039]
On the other hand, the drive part 71 of the main throttle valve 66 is disposed on the opposite side of the camshaft drive mechanism 48, that is, on the left side of the engine 17, so that the drive part of the main throttle valve 66 is disposed on the camshaft drive mechanism 48 side. Accordingly, the fuel injection device 18 is installed close to the engine 17 without interfering with the camshaft drive mechanism 48 that protrudes in the front-rear direction of the engine 17. This can greatly contribute to the downsizing of the engine 17.
[0040]
In the above-described embodiment, the engine 17 is a parallel 4-cylinder engine. However, for example, the engine 17 is an engine having another cylinder arrangement, such as a single-cylinder engine, a parallel 2-cylinder to 3-cylinder engine, a V-type engine, or a square-type engine. Also, the configuration around the fuel injection device 18 can be applied or applied.
[0041]
In the above embodiment, the camshaft drive mechanism 48 is provided on the right side of the engine 17, the drive portion 71 of the main throttle valve 66 is provided on the left side surface of the left fuel injection device 18, and the drive portion 72 of the sub throttle valve 67. The valve position sensor 73 is provided on the right side surface of the right fuel injection device 18, but the left-right positional relationship between these members 48, 71, 72, 73 may be completely reversed.
[0042]
【The invention's effect】
As described above, the motorcycle according to the present invention is equipped with a parallel multi-cylinder engine having a plurality of fuel injection devices arranged in a row in the vehicle width direction between a pair of left and right main pipes constituting the body frame. In a motorcycle in which a main throttle valve and a sub-throttle valve are installed inside the fuel injection device, the fuel injection devices (18) are arranged so as to overlap the main pipe (10) in a side view of the vehicle. A drive portion (71) of the main throttle valve (66) is disposed on one side surface of the fuel injection device located closest to the vehicle width direction of the injection device (18), and the most of each fuel injection device (18). the other side surface of the fuel injector positioned in the vehicle width direction the other side driving section of the sub-throttle valve (67) and (72) are arranged, these driving unit (71, 72) the vehicle Place a plane view in the main pipe (10) and overlaps the engine (17) portion in the vehicle width direction inner dimension, wherein each fuel injector (18), said the driver of the sub-throttle valve (67) (72) The actuator (85) is interlocked and connected, and the actuator (85) is provided on the inner side in the vehicle width direction from the drive portion (72) of the sub-throttle valve (67), and the actuator (85) in the vehicle side view. Are offset from the respective fuel injection devices (18), and a cam shaft drive mechanism (48) is provided on one side of the engine (17), the drive portion of the main throttle valve (66) (71) is arranged on the opposite side in the vehicle width direction of the engine provided with the camshaft drive mechanism (48). The drive part of the lottle valve and the drive part of the sub-throttle valve are distributed and arranged so that each drive part fits in a small space and does not protrude outward from the engine. It is possible to prevent the main pipe of the vehicle body frame from being enlarged, and to prevent the rider's rideability and running performance from deteriorating, and to facilitate the design and manufacture of the vehicle body frame. .
[Brief description of the drawings]
FIG. 1 is a left side view showing an example of a motorcycle according to the present invention.
2 is a longitudinal sectional view of an engine, a fuel injection device, and an air cleaner taken along line II-II in FIG. 3;
FIG. 3 is a rear view of an engine and a fuel injection device showing one embodiment of the present invention as viewed in the direction of arrow III in FIG. 2;
4 is an enlarged longitudinal sectional view of the fuel injection device shown in FIG. 2. FIG.
FIG. 5 is a view taken in the direction of arrow V in FIG. 3;
6 is a view taken along arrow VI in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 10 Main pipe 14 Fuel tank 17 Engine 18 Fuel injection device 48 Cam shaft drive mechanism 61 Throttle body 62 Throttle passage 63 Injector nozzle 66 Main throttle valve 67 Subthrottle valve 71 Main throttle valve drive part 72 Subthrottle Valve drive 73 Valve position sensor 85 Actuator

Claims (4)

A parallel multi-cylinder engine having a plurality of fuel injection devices arranged in a row in the vehicle width direction is mounted between a pair of left and right main pipes constituting the body frame, and a main throttle valve and a sub-throttle valve are provided in each fuel injection device. In motorcycles installed with
The fuel injection devices (18) are arranged so as to overlap the main pipe (10) in a side view of the vehicle,
A drive portion (71) of the main throttle valve (66) is disposed on one side surface of the fuel injection device located on the most lateral side in the vehicle width direction of each fuel injection device (18) and each fuel injection device (18). ) Of the sub-throttle valve (67) is disposed on the other side of the fuel injection device located on the other side in the vehicle width direction ,
These drive parts (71, 72) are arranged in the vehicle width direction dimension of the engine (17) part overlapping the main pipe (10) in a vehicle side view,
Each of the fuel injection devices (18) has an actuator (85) that is interlocked with the drive portion (72) of the sub-throttle valve (67),
The actuator (85) is provided on the inner side in the vehicle width direction from the drive portion (72) of the sub-throttle valve (67), and the actuator (85) is offset from the fuel injection devices (18) in a vehicle side view. Te place,
When the camshaft drive mechanism (48) is provided on one side of the engine (17), the drive portion (71) of the main throttle valve (66) is provided with the camshaft drive mechanism (48). A motorcycle characterized by being arranged on the opposite side of the engine width direction of the engine .   The actuator (85) is disposed in a space surrounded by a fuel tank (14) installed at an upper portion of the main pipe (10), the main pipe (10), and the engine (17). The described motorcycle. The motorcycle according to claim 1 or 2, wherein a valve position sensor (73) for detecting an opening degree of the main throttle valve (66) is provided on a drive part ( 72 ) side of the sub-throttle valve (67).   The longitudinal direction of the throttle passage (62) in a side view is substantially perpendicular to the longitudinal direction of the main pipe (10), and is located on the upper side of the main throttle valve (66) and the sub throttle valve (67). The motorcycle according to any one of claims 1 to 3, wherein the position of the fuel injection device (18) is set so that the throttle valve is positioned above the upper edge of the main pipe (10).

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